3x+20=7x-80

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Solution for 3x+20=7x-80 equation: 



3x+20=7x-80

We move all terms to the left:

3x+20-(7x-80)=0

We get rid of parentheses

3x-7x+80+20=0

We add all the numbers together, and all the variables

-4x+100=0

We move all terms containing x to the left, all other terms to the right

-4x=-100

x=-100/-4

x=+25

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